Investigation of cam mechanisms (GL 112)

Investigation of cam mechanisms (GL 112)

record elevation curves of cam mechanisms

CodeGL112

Description:

  • Cam mechanisms play an important role in the conversion of rotary motion into oscillatory motion.
  • The most common application of cam mechanisms is the activation of valves in engines.
  • This application is highly dynamic: valves must be opened and closed in very quick succession.
  • The contact between the valve and a cam must not be lost, otherwise it would result in uncontrolled oscillations, valve float and possible damage to the engine.
  • The GL 112experimental unit allows the dynamic investigation of a cam mechanism at various speeds.
  • Four typical cams with corresponding engaging members are compared in terms of their motion behaviour.
  • The valve is simulated with a mass and a spring.
  • By varying the spring stiffness, spring preload and oscillating mass, it is possible to study the dynamic limits of the respective cams.
  • The cam motions and valve raising can be clearly demonstrated using a stroboscope (not included).
  • A recorder synchronised with the cam member records the actual elevation curve of the cam mechanism.
  • A speed-controlled drive motor with a large flywheel generates a speed as constant as possible.
  • The open design means that the motion is clearly visible in every detail.
  • A transparent protective cover ensures safe operation.
  • The experimental unit is intended for demonstration in engineering education.
  • It is not suitable to be used as a test bench in the field of endurance testing/tribology.

Technical Details:

Specification:

  • investigation of cam mechanisms
  • cam-shaped cam members: tangent cam, hollow cam, 2 circular arm cams with different head radius
  • 2 different engaging members: flat receiver with plunger or rolling receiver with plunger
  • 3 interchangeable return springs and spring preload
  • drive motor with variable speed
  • oscillating mass can be increased with 5 additional weights
  • mechanical drum recorder with nib and coated paper
  • optical speed sensor
  • transparent protective cover for safe operation

Technical Data:

  • Drive motor
    • DC asynchronous motor with frequency converter
    • power: 250W
    • speed: 60…670min-1
  • Cam-shaped cam member
    • stroke, each: 15mm
    • opening angle, each: 140°
  • Spring stiffness
    • hard: 5026N/m
    • medium: 2601N/m
    • soft: 613N/m
  • Masses
    • additional weight: 200g
    • plunger: 530g
    • flat receiver: 93g
    • rolling receiver: 20g
  • Recorder: toothed belt drive
  • 230V, 50Hz, 1 phase
  • 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
  • UL/CSA optional

Dimensions & Weight:

  • L x W x H: 800x440x440mm (experimental unit)
  • Weight: approx. 40kg
  • L x W x H: 360x320x160mm (display and control unit)
  • Weight: approx. 5kg

Learning Objectives/Experiments:

  • elevation curves in non-matching engaging member
  • elevation curve in sprung-engaging member
  • determine the limit speed and compare with theory
  • influence of moving mass on the motion of cam member/plunger
  • influence of return-spring stiffness and preload on the motion of cam member/plunger
  • comparison of the elevation curves of different cam-member shapes
  • comparison of elevation curves with theory

Scope of Delivery:

  • 1 experimental unit
  • 1 display and control unit
  • 4 cam-shaped cam members
  • 2 engaging members
  • 3 return springs
  • 3 blocks of recorder paper
  • 1 set of tools
  • 1 set of instructional material

Features:

  • record elevation curves of cam mechanisms
  • four different cam members, two different engaging members
  • influence of spring stiffness and mass on the dynamic behaviour

Accessories:

Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.